Amido-oxy-sulfonic acid of phenylnaphthimidazol and process of making same.



UNITED STATES PATENT oEFIoE.

OSCAR SOHULTHESS, or BERLIN, AND LEO KERKOVIUS, or FRIEDENAU, NEAR BERLIN, GERMANY, ASSIGNORS TO ACTIEN GESELLSOHAFT FUR ANILINFABRIKATION, or BERLIN, GERMANY.

AMIDO-OXY-SULFONIC ACID 0F PHENYLNAPHTHIMIDAZOL AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented April 23, 1907.

Application filed November 13, 1905. Serial No. 287,204.

To all when it may concern: v

Be it known that we, OSCAR SCHULTHESS and LEO KERKOVIUS, citizens of the Swiss Republic andRussian Empire, respectively, residents, respectively, of Berlin and of Friedenau, near Berlin, in the Kingdom of Prussia, German Empire, have invented new and useful Improvementsin' Amido-Oxy- Sulfonid Acids of Phenylnaphthimidazol and Processes ofMaking the Same; and we do hereby declare that the following is a full,

I naphthimidazol:

which acids have been found to be a valuable parent-material for the production ofdyestufi's. As we have found these acids may be pre ared by melting an amidodisulfonic aci o? the phenyl-l.Q naphthimidazol,-as

- represented by the following formula:

given. They ma be (Belly son withacaustic alkili.

agents, into the naphthimidazol-derivative.

As anexample, when using nitrobenzaldehyd and an acid reducing agent the following formulae illustrate the process:

NHa Qu -(momma W soar sour

It is not necessary to isolate the 1.2-diamidonaphthalene-sulfonic acid; one can also directly use a solution of it which is obtained by reduc 119; With a suitable agent a mono- 5 i azo-dyestuff which is prepared by the action of a sultable diazo-compound, for instance the diazo-compound of sulfanilic acid, in an acid solution on the 2-naphthylamin-5J-disulfonic acid. 7 0

Another way to obtain the above amido 's ulfonic acids of phenyl-l.2-naphthimidazol is the following: One prepares first a monoazo-dyestuff for instance from the 2-naphthylamin-5.7-disulfonic acidby combining the respective sulfonic acid in an acid solution with a suitable diazo-compound, as for instance the diazo-compound of para-nitranilin. Thus is obtained for instance the fol lowing dyestuff sonMihiiY Now by acting on this 'dyestufl with a nitro- 9o benzaldehyd at ordinary tern erature one obtains the following oompoun N CH-CoHi. N02

IOO

rid, in the heat is converted into the desired naphthimidazol-5.7-disulfonic acid:

. o.c6Hi.NH2 SOsH NH Ill W the naphthimidazol-ring whilst at the same time the residue of the para-nitranilin is eliminated in the form of para-phehyleneraised up to 170 diamin .and the nitro-group of the residueof the benzaldehyd is reduced.

The following example may serve to illustrate our invention, the parts being by weight: 46 parts of the sodium salt of the meta-amidophenyl-l .Z-naphthimidazol 5.7- disulfonic acid:

' N 03s I 1 N v (a) a C10Hi oouuiNnz (UNZtOaS (2) H 1 (3) are introduced at about 130 into a mixture of parts of caustic potash and 20 parts of water. The temperature is then gradually The reaction being linished after about an hour the mass is poured on ice and acidulated by means oihydrochl oric acid. 011 cooling the product oi the reaction separates out and is isolated by l'iltering, washing and drying. v Thus is obtained the meta-amidophenyl-l.Z-naphthimidazol- 5-oxy-7-suli'onic acid:

forming a slightly yellowish colored powder,

difiicultly soluble in water, but easily soluble in alkaline solutions; by acidulating slightlyv such a solution with a mineralacid, the -free sulfonic acid se arates, but redissolves when an excess of hy rochloric acid is added.

Of course our present invention is not limited to the above example nor to the details given therein. So for instance instead of the. meta-amidophenyl-derivative of naphthimidazol whichis used in the foregoing example, the corresponding para amido derivative may be employed; the melting operation may also be performed with caustic soda instead of caustic potash. l

Having now described our invention and in what manner the same is to be performed what we claim is,

1. A process for the manufacture of amidooxysulfom'c acids of phenyl-l.2-naphthimi- 65 dazol which process consists in heating with a caustic alkali an amidodisulfonic acid'of phenyl-1.2naphthimidazol of the character dc.- fined in the above specification.

2. A process for the manufacture of metaamidopheniyl-l.2-naphthimidazol-5-oxy 7- sulfonic acid which process consists in heating the sodium salt of the meta-amidophenyl- 1.2-napl1thimidazol-5.7-disulfonic acid with i caustic potash up to 170 0..

3. As new articles of manufacture the amidooxysullonic acids of phenyl-12-naphthimidazol v v metaamidophenyl 1.2-naphtl1imidazol 5- oxy-7-sulfonic acid is defined in the above specification, whichacid is a slightly yellowish colored powder, dillicultly soluble in water, but easily soluble in alkaline solution and which acid is precipitated from such a solution by slightly acidulating by means'of a mineral acid or of acetic acid, but which precipitate by the addition of an excess of hydrochloric acid is dissolved, and which amidooxysulfonic acid when combinedin an alkaline solution with the diazo-compound of anilin, yields a dyestufl dyeing cotton without a mordant a scarlet shade. I y

In witness whereof we have hereunto signed our name this 28th day of October 1905, inthejpresence of two subscribing witnesses.

OSCAR SCHULTHESS. .LEO KERKOVIUS.

loo 

